#include<stdio.h>
int main()
{
	char s[] = "012xy";
	int i = 0;
	int n = 0;
	for (i = 0; s[i] != 0; i++)
		if (s[i] >= 'a' && s[i] <= 'z')
			n++;
	printf("%d\n", n);
	return 0;
}